MCM Electronics

InternetSer350 Low Profile Serial MonitorMCM Part #: 28-8870  |  Tripp Lite Part #: INTERNET350SER

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  • Protect personal computers, modems and peripherals
  • Six outlets (three UPS/surge, three surge only) protect your entire computer set-up
  • Built-in RJ-11 jacks provide modem/fax protection on up to two lines simultaneously
  • DB-9 communication port and free PowerAlert software (web download) for unattended system shutdown
  • 350 and 550VA models offer a new compact cabinet design

  • 120VAC/60Hz
  • NEMA 5-15R receptacles
  • EMI/RFI filtering = 40dB at 1MHz
  • $25,000 Ultimate Lifetime Insurance covers connected equipment against surge damage for life

  • Product Description


  • Voltage compatibility: 120VAC
  • Frequency compatibility: 60 Hz


  • Output volt amp capacity (VA): 350
  • Output watt capacity (watts): 180
  • Output nominal voltage: 120V
  • Output voltage regulation: LINE MODE: Passes sine wave line voltage from 100-141V to connected equipment unchanged BATTERY MODE: PWM sine wave output 115V +/-5%
  • Output frequency regulation: LINE MODE: Passes line frequency of 60Hz +/-10% BATTERY MODE: Inverter output regulated to 60zHz +/-0.5Hz
  • Outlet quantity / type: 6 NEMA 5-15R


  • Maximum input amps: 12A
  • Input connection type: NEMA 5-15R space saving right-angle plug
  • Input cord length: 6 ft., 16 gauge
  • Recommended electrical service: 15A, 120VAC


  • Full load runtime: 2.5 minutes (350VA)
  • Half load runtime: 10 minutes (175VA)
  • DC system voltage: 12VDC
  • Typical battery lifespan: 3-6 years, depending on usage
  • Battery recharge rate: 2-4 hours to 90%


  • Front panel LEDs: 2 LEDs indicate line power, battery power status
  • Alarms: Audible alarm indicates battery backup operation
  • Switches: Power on/off switch


  • AC surge suppression: 380 joules
  • AC suppression response time: Instantaneous
  • Dataline suppression: Tel/DSL
  • EMI / RFI AC noise suppression: Yes


  • Shipping weight (lbs): 10
  • Shipping weight (kg): 4.54
  • Unit weight (lbs): 7.7
  • Unit weight (kg): 3.5
  • Unit Dimensions (HWD/in): 3 x 10.5 x 5
  • Unit Dimensions (HWD/cm): 7.6 x 26.7 x 12.7
  • Shipping Dimensions (HWD/in): 4.5 x 12.5 x 7.75
  • Shipping Dimensions (HWD/cm): 11.4 x 31.8 x 19.7
  • Material of construction: ABS
  • Form factors supported: Ultra-compact


  • Operating Temperature: +32 to +104 degrees Fahrenheit, 0 to +40 degrees Celsius
  • Storage Temperature: +5 to +122 degrees Fahrenheit, -15 to +50 degrees Celsius
  • Relative Humidity: 0 to 95%, non-condensing


  • Network monitoring port: DB9
  • Software and cabling included: Includes DB9 serial cable, PowerAlert software available via free download from


  • Transfer time from line power to battery mode: 2-4 milliseconds
  • Low voltage transfer to battery power: Switches to battery power as line voltage drops to 99V or lower. Switches back to AC as line voltage increases to 104v or higher
  • High voltage transfer to battery power: Switches to battery power as line voltage increases to 139V or higher. Switches to AC mode as line voltage decreases to 135V or lower


  • Certifications: Tested to UL1778 (USA), Tested to CSA (Canada), Class B (Emissions), NOM (Mexico), FCC Part 68 / Industry Canada (telecommunications)


  • Product warranty: 2 years
  • Connected equipment insurance (USA and Canada Only): $100,000 connected equipment insurance (USA and Canada only)


  • Cold Start: Inverter can be ""cold started"" to enable temporary AC output during a power failure
  • Appearance: Attractive black ultra-compact housing

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    Package Specifications & Dimensions
    Weight:10.37 lbs.
    Warranty:90 days
    Need to Return?
    Length:13.5 in.
    Width:9.5 in.
    Height:5 in.
    Shipping Information
    Extra Shipping Charge:No
    Drop Ship:No
    Catalog Pages

    MCM Cat 57, Page 850

    MCM Cat 56, Page 760

    Mfr. Info

    Tripp Lite Logo
    Mfr. Name:Tripp Lite
    Mfr. Part Number:INTERNET350SER